The teeth of the young pig are clipped as soon as possible after birth. The piglet is born with 8 teeth. If the teeth are not clipped the sow's (mother) udder may be injured by the suckling piglets. Removal of the teeth also prevents the young pigs injuring themselves while fighting or playing.
Piglets bite the sow (mother) in their fight to get hold of one of her teats and suckle. The pain caused by this disturbs the sow causing her to get up and prevent her young from feeding. The cuts to the sow's udder also allow germs to infect the udder. In their fight to grasp the teat and suckle, piglets will also bite and injure one another. The simple practice of clipping the teeth as soon as possible after birth prevents these problems.
The piglet's teeth should be cut as soon as possible after its birth. The teeth can be cut when the pig is only 15 minutes old. The sow and her young should be separated for as short a time as possible. In order to clip the teeth you will need either a pair of tooth clippers or pliers or forceps.
You will need someone to help you separate the sow and her young. You will also need a box containing bedding and a clean empty pen.
Source : Pashu sakhi Handbook